An interest observation courtesy of Mint: of the 307,868,280 Americans out there, which compose 151,485,000 tax units, 46.9% will have zero federal income tax liability in 2009. Brilliant plan to keep the country happy: the poor pay no taxes, the rich get a massive stock market bubble to sell into, and the disappearing middle class…well, they can pay $20 for a hotdog and beer combo in Prague on that once-every-five-years vacation.